GPU picky?

[Ambitious_but_rubbish]

can a gpu refuse to work in 1st pcie slot? it wouldnt give display on asus b450-f gaming 1st pcie slot but when i upgraded to b550m-plus still no display? works perfectly in second pcie slot on both mobos

 

[FalseControl]

MB might be set to Gen 3 speeds when its a gen 4 card? Maybe? Need more info about GPU

[HQuan]

No, GPU are not that picky. They're are not picky worker.

 

But if you place your GPU at lower slot, you will wasting some valuble bandwidth.

 

/s

[Eigenvektor]

17 minutes ago, FalseControl said:

MB might be set to Gen 3 speeds when its a gen 4 card? Maybe? Need more info about GPU

Wouldn't matter, since PCIe is backwards compatible. A gen 4 card works in a gen 3 slot and vice versa.

 

I would re-test with another card or some other device. @Ambitious_but_rubbish did you keep your CPU when you switched boards? The first slot is directly connected to the CPU, so it's possible the CPU's PCIe controller is faulty. It seems unlikely the first slot on both boards is damaged, but could still be possible also.

[Ambitious_but_rubbish]

8 hours ago, HQuan said:

No, GPU are not that picky. They're are not picky worker.

 

But if you place your GPU at lower slot, you will wasting some valuble bandwidth.

 

/s

i know which is why i want it to be in the 1st pcie slot but it refuses to give display

 

[Ambitious_but_rubbish]

7 hours ago, Eigenvektor said:

Wouldn't matter, since PCIe is backwards compatible. A gen 4 card works in a gen 3 slot and vice versa.

 

I would re-test with another card or some other device. @Ambitious_but_rubbish did you keep your CPU when you switched boards? The first slot is directly connected to the CPU, so it's possible the CPU's PCIe controller is faulty. It seems unlikely the first slot on both boards is damaged, but could still be possible also.

yes, i kept my ryzen 7 3700x cpu 

 

[Ambitious_but_rubbish]

8 hours ago, FalseControl said:

MB might be set to Gen 3 speeds when its a gen 4 card? Maybe? Need more info about GPU

aorus 3060ti elite rev 2.0 8gb 

[Eigenvektor]

1 hour ago, Ambitious_but_rubbish said:

yes, i kept my ryzen 7 3700x cpu

As I said, try to test with some other PCIe card (doesn't have to be a GPU). See if that works in the top slot. My suspicion would be that the CPU's PCIe lanes have an issue, not the motherboard(s) or GPU.

[Ambitious_but_rubbish]

9 minutes ago, Eigenvektor said:

As I said, try to test with some other PCIe card (doesn't have to be a GPU). See if that works in the top slot. My suspicion would be that the CPU's PCIe lanes have an issue, not the motherboard(s) or GPU.

i dont have any other gpu's, the only other PCIE thing i have is a wifi card thats in the pciex1 slot. i also found someone else who had a similiar issue, should i just send my gpu back for replacement? https://forums.tomshardware.com/threads/top-pcie-slot-not-working-with-3700x.3700810/#post-22307242

 

[HQuan]

2 hours ago, Ambitious_but_rubbish said:

i know which is why i want it to be in the 1st pcie slot but it refuses to give display

 

What's your GPU?

[Eigenvektor]

3 hours ago, Ambitious_but_rubbish said:

i dont have any other gpu's, the only other PCIE thing i have is a wifi card thats in the pciex1 slot. i also found someone else who had a similiar issue, should i just send my gpu back for replacement? https://forums.tomshardware.com/threads/top-pcie-slot-not-working-with-3700x.3700810/#post-22307242

If it's still under warranty, it's certainly worth a try.

 

You can actually use an x1 card in an x16 slot. Technically you can even use an x16 card in an x1 slot, provided it is open ended, so the additional length can stick out. The slot (or card) will simply run in x1 mode then.

[Ambitious_but_rubbish]

8 hours ago, Eigenvektor said:

If it's still under warranty, it's certainly worth a try.

 

You can actually use an x1 card in an x16 slot. Technically you can even use an x16 card in an x1 slot, provided it is open ended, so the additional length can stick out. The slot (or card) will simply run in x1 mode then.

what is pcie line controller? 

 

[Eigenvektor]

1 hour ago, Ambitious_but_rubbish said:

what is pcie line controller?

The controller(s) responsible for communicating with PCIe devices attached to a PCIe slot. There are usually two of those, one in the CPU and one on the motherboard.

 

The PCIe slots (and M.2 slots) on your motherboard are attached to those PCIe controllers over PCIe lanes (not lines). The first PCIe slot and primary M.2 are usually attached directly to the CPU, while the others are attached to a PCIe controller on the motherboard, which is in turn attached to the CPU's controller.

 

If the controller is faulty, it's possible one or more of those slots don't work, as seems to be the case here.

[Ambitious_but_rubbish]

28 minutes ago, Eigenvektor said:

The controller(s) responsible for communicating with PCIe devices attached to a PCIe slot. There are usually two of those, one in the CPU and one on the motherboard.

 

The PCIe slots (and M.2 slots) on your motherboard are attached to those PCIe controllers over PCIe lanes (not lines). The first PCIe slot and primary M.2 are usually attached directly to the CPU, while the others are attached to a PCIe controller on the motherboard, which is in turn attached to the CPU's controller.

 

If the controller is faulty, it's possible one or more of those slots don't work, as seems to be the case here.

wait so now im confused, which one do i try to return now? 

[Eigenvektor]

1 hour ago, Ambitious_but_rubbish said:

wait so now im confused, which one do i try to return now? 

The CPU.

 

As I said, the first PCIe slot is directly attached to the controller that is part of the CPU. Technically, if that slot isn't working it could be a defect of the motherboard or the CPU. Since you changed MBs already and the issue is the same, it is more likely an issue with the CPU, rather than the board.

[Ambitious_but_rubbish]

2 hours ago, Eigenvektor said:

The CPU.

 

As I said, the first PCIe slot is directly attached to the controller that is part of the CPU. Technically, if that slot isn't working it could be a defect of the motherboard or the CPU. Since you changed MBs already and the issue is the same, it is more likely an issue with the CPU, rather than the board.

damn, i got my cpu secondhand, dont think they'll repair it, anyways thanks homie